As details continue to emerge about the controversial meeting between Donald Trump Jr. and a Russian lawyer, among others, at Trump Tower during the presidential campaign, more and more questions will need to be answered about Russian interference in the U.S. presidential election.

The motive for the meeting, the nature of the meeting and the attendees involved have all changed since the story broke. But as emails released by Trump Jr. show, he believe he was meeting the lawyer, Natalia Veselnitskaya, to obtain damaging information about his father’s then-Democratic rival Hillary Clinton.

Here is a rundown of everything that has said by either those involved or those connected to the Trump administration.